I've recently read that BM gained her devil fruit ability after the death of Mother Carmel but she did not eat the fruit for it so it had me wondering. Ok, we all know it's implied that BM actually ate Mother Carmel and the other kids of the sheep house and they didn't actually "disappear" and soon after this she gains the abilities of the Soru Soru no Mi, Mother Carmel's devil fruit. This might imply that if you were to 'eat/consume' a person you could gain their devil fruit ability. Which brings us to Blackbeard, who after putting a curtain over Whitebeard's dead body and doing something (which we don't know), when he came out from under it he was able to use both the powers of two devil fruits. So is it possible that while he was underneath he 'ate/consumed' a part of Whitebeard in some way to gain the abilities of the Gura Gura no Mi? It's kind of a gross/disturbing theory and it's been stated that back in Enies Lobby that a person can't eat two devil fruits or they will explode, but Marco once stated that Blackbeard wasn't 'normal' and that his body was 'odd' which might explain why he didn't explode aft gaining two devil fruit abilities. That's it, I just wanted to put this out somewhere cause it got me thinking about how BM got her power and if Blackbeard maybe heard about it and decided to try it out too.